DIRECT MEASUREMENT OF REACTION FORCES DURING FAST DYNAMIC LOADING - APPLICATIONS FOR SHPB AND ITS MODIFICATION

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21260%2F19%3A00335590" target="_blank" >RIV/68407700:21260/19:00335590 - isvavai.cz</a>

Result on the web

<a href="https://ojs.cvut.cz/ojs/index.php/APP/article/view/6019" target="_blank" >https://ojs.cvut.cz/ojs/index.php/APP/article/view/6019</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

DIRECT MEASUREMENT OF REACTION FORCES DURING FAST DYNAMIC LOADING - APPLICATIONS FOR SHPB AND ITS MODIFICATION

Original language description

The presented paper is focused on embedding of the serially manufactured piezo-electric impact load-cell into Split Hopkinson Pressure Bar (SHPB) for a direct force measurement during dynamic loading. Conventionally, during the SHPB test dynamic force equilibrium is investigated by a comparison of the transmitted signal wave and the difference between the incident and reflected signals waves to the incident bar, measured by strain gauges cite{bib1}. However, in the experiments with specimens with low linebreak mechanical impedance, a major portion of the incident wave is reflected back on the boundary between the bar and the specimen. Comparison between two-large amplitude incident and reflected pulse and linebreak a small-amplitude transmitted pulse can be influenced by large error and resulting force equilibrium can be inaccurate. Therefore, a piezo-electric quartz impact force transducer was used to directly measure the axial forces in the vicinity of the specimen end surfaces, allowing to analyze the force equilibrium which is an essential characteristic for reliable measurement. Measured values from strain gauges were compared with values obtained from force transducer, to verify the validity of the acquired signals which will increase the reliability of the measured data. The presented solution will help to determine the mechanical properties of advanced materials which is necessary for investigation of complex modern material structures behaviour.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

21100 - Other engineering and technologies

Project

<a href="/en/project/GA19-23675S" target="_blank" >GA19-23675S: Progressive numerical and experimental modelling of innovative sandwich panels with cellular core</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

17th YOUTH SYMPOSIUM ON EXPERIMENTAL SOLID MECHANICS

ISBN

978-80-01-06670-6

ISSN

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e-ISSN

2336-5382

Number of pages

4

Pages from-to

32-35

Publisher name

Česká technika - nakladatelství ČVUT

Place of publication

Praha

Event location

Telč

Event date

Jun 6, 2019

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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